diff --git a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
index 52cc53946b..61f921813b 100644
--- a/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
+++ b/src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php
@@ -85,7 +85,7 @@ class YamlFileLoader extends FileLoader
      * @param array  $content
      * @param string $file
      */
-    private function parseImports($content, $file)
+    private function parseImports(array $content, $file)
     {
         if (!isset($content['imports'])) {
             return;
@@ -112,7 +112,7 @@ class YamlFileLoader extends FileLoader
      * @param array  $content
      * @param string $file
      */
-    private function parseDefinitions($content, $file)
+    private function parseDefinitions(array $content, $file)
     {
         if (!isset($content['services'])) {
             return;
@@ -420,7 +420,7 @@ class YamlFileLoader extends FileLoader
      *
      * @param array $content
      */
-    private function loadFromExtensions($content)
+    private function loadFromExtensions(array $content)
     {
         foreach ($content as $namespace => $values) {
             if (in_array($namespace, array('imports', 'parameters', 'services'))) {